Comment 42 for bug 459730

For what its worth, this bug is just a warning.
If you see these messages in /var/log/rsyslog, you can safely ignore them.
They are simply rsyslog saing that /dev/xconsole does not exist, and then going on with life. This happens on perfectly functioning systems.

If your system crashes and these are the last messages in that log it is because the last thing written was when rsyslog started, and the crash logged nothing there.